Summary

Acoustically laminated Quaternary deposits (up to 800 m thick) dominated by turbidites overlie transparent hemipelagic sediments (Pliocene and older) in the Ulleung (Tsushima) Basin. The topmost layer in sediment cores is post-glacial hemipelagic sediment, about 2 m thick, underlain largely by a repetitive sequence of fine-grained, thinly- or un-laminated turbidites. Coarse-grained, graded and plane-laminated units rarely occur. Turbidites in the Ulleung Basin were accumulated at a rate of about 12 cm/103 years. The turbidites in the centre of the Ulleung Basin correspond to slump, slide and debris-flow deposits on the slope and base-of-slope environments. It suggests that the mass-flow processes occur successively from a broad, linear source on the prograding shelf break. Sediments originated from the adjoining margins of the Korean Peninsula and north western Honshu. Turbidites deposited during the major volcanic eruptions were derived from the Oki Spur and San-in coast, whereas those deposited between the volcanic events were mainly from the stable craton of the eastern margin of the Korean Peninsula.

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